Quickest 7h 35min
There are 1 train company operating 2 routes - Empire Builder, Southwest Chief, 2 flights from SPK to DDG. The cheapest train costs $393 and is 2d 1h 17min.
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There are 3 ways to travel from SPK to DDG. 4 trains, 2 flights and 1 by car are possible between the two areas. The by car from SPK to DDG is the cheapest. The flight from GEG to LBL is the fastest. The train operated by Amtrak running from SPK to DDG is the most convenient.
It's important to check each mode when booking your ticket so that you can find the best method for you. The cost of each type varies differently, so be sure to use Faretrotter to keep an eye out!